Lect17_Receiver Arch II

Lect17_Receiver Arch II - ECE 620 Introduction to RF...

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ECE 620 Introduction to RF Integrated Circuits Prof. Waleed Khalil Lecture Receivers Architecture II 17 1
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Outline Homodyne Receiver 2
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Homodyne Receiver A.K.A. Direct Conversion (DC) or Zero-IF Receiver IF= 0 One-step conversion to baseband as apposed to Heterodyne RX’s two-step (or more) conversion No Image problem Signal is mirrored on itself No IR Filter Low-Q CS filter implemented directly in baseband Least number of components and lowest power Only band-select filter 3
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Single Mixer : Symmetrical Signals Upper and lower sidebands are identical Signal real and imaginary parts are converted to DC Mirroring doesn’t impact baseband signal 4
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Single Mixer : Asymmetrical Signals
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This note was uploaded on 11/21/2011 for the course ECE 620 taught by Professor Khalil during the Fall '11 term at Ohio State.

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Lect17_Receiver Arch II - ECE 620 Introduction to RF...

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